The UPS is rated for output power factor of 0.8, while the input is power factor corrected. The result is a lower input current than output current, as the difference in power factor is 20 percent. As we charge at maximally 10% (of kW rating) and the losses in the unit are around 5% of the input current, we will see a nominal input current when charging at a level approximately 5% lower than the maximal nominal output current at load PF 0.8.